CSI Reporting Frequency Granularity Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately reporting channel state information (CSI) between user equipment (UE) and base stations (BS), particularly in efficiently configuring CSI reporting bands and frequency granularity, which affects data communication quality.
Innovation Solution
The implementation of a method and apparatus for UE and BS to receive and transmit CSI reports with identified frequency granularity, including a CSI reporting band within a bandwidth part (BWP) comprising M physical resource blocks (PRBs), where the frequency granularity is based on whether M is less than a threshold N, enabling the inclusion of precoding matrix indicators (PMI) and channel quality indicators (CQI) in the reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency granularity of CSI reporting is increased, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the frequency granularity configurable and adaptable. The base station can dynamically adjust the frequency granularity parameter based on channel conditions, UE capability, and network requirements. This allows the system to transition between fine-grained and coarse-grained reporting as needed, optimizing the balance between measurement precision and device complexity for different operational scenarios.
Solution Approach 2:
The patent implements parameter changes by introducing configurable frequency granularity as a key parameter in CSI reporting. By varying this parameter, the system can adjust the resolution of frequency domain reporting without changing the fundamental reporting mechanism. This enables flexible control over measurement precision while managing the complexity burden on UE and base station.
2Measurement precision
If CSI reporting band is expanded to cover wider frequency range, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies segmentation by dividing the wide frequency band into multiple subbands for CSI reporting. Instead of reporting across the entire frequency range in a single measurement, the system segments the bandwidth and performs reporting in manageable portions. This reduces the time required for each individual measurement while maintaining overall measurement precision across the full frequency range through aggregated results.
Solution Approach 2:
The patent implements partial action by allowing selective reporting of CSI for specific frequency subbands rather than requiring comprehensive reporting across the entire bandwidth. The base station can configure the UE to report only for relevant subbands based on current transmission requirements, reducing the time burden while maintaining sufficient measurement precision for active data transmission.
Data Source
AI summary
A method for operating a user equipment (UE) comprises receiving channel state information (CSI) reporting configuration information including a CSI reporting band and a frequency granularity of CSI reporting, where the CSI reporting band is within a bandwidth part (BWP) comprising M physical resource blocks (PRBs), and the frequency granularity of CSI reporting is based on whether M<N, where N is a threshold; identifying the frequency granularity of CSI reporting; generating a CSI report with the identified frequency granularity, wherein the CSI report includes at least one of a precoding matrix indicator (PMI) and a channel quality indicator (CQI); and transmitting the CSI report over an uplink (UL) channel.